Beat-up mechanism for looms

ABSTRACT

The beat-up mechanism is intended for use in looms wherein the weft thread carriers are associated with a drive independent of the beat-up mechanism. The proposed mechanism may also be incorporated in looms of the progressive shedding type. The beat-up mechanism comprises beat-up discs with lugs and slots and discs with thread-engaging teeth adapted to engage the weft thread, the apices of these teeth being disposed radially intermediate of the apices of the beat-up lugs and the edges of the beat-up discs in the vicinity of the slots, the leading edge of the thread-engaging tooth being aligned with the rear wall of the slot and being an extension of this wall. The discs with the thread-engaging teeth ensure guiding of the weft thread placed outside of the beat-up mechanism into the slots of the beat-up discs, to advance the weft thread toward the fell of the cloth and to make the thread leave the slots adjacent to the fell of the cloth, for subsequent weaving of the weft thread into the cloth.

Sept. 3, 1974 BEAT-UP MECHANISM FOR LOOMS Inventors: Evgeny Dmitrievich Loschilin, ulitsa Primary Examiner Henry Jaudon 8 Marta, 34a, Domodedovo, Moskovskoi oblasti' [57] ABSTRACT The beat-up mechanism is intended for use in looms Valerian Alexeevich Borodin, ulitsa Gubkina,

Moscow; lexandr wherein the weft thread carriers are associated with a Alexandrovich Zabotm,

profsojuznaya ulitsa kv drive independent of the beat-up mechanism. The proposed mechanism may also be incorporated in looms of the progressive shedding type. The beat-up mechanism comprises beat-up discs with Moscow; Eduard Arshakovich lugs and slots and discs with thread-engaging teeth adapted to engage the weft thread, the apices of these teeth being disposed radially intermediate of the apices of the beat-up lugs and the edges of the beat-up discs in the vicinity of the slots, the leading edge of the thread-engaging tooth being aligned with the rear wall of the slot and being an extension of this wall.

The discs with the thread-engaging teeth ensure guiding of the weft thread placed outside of the beat-up mechanism into the slots of the beat-up discs, to advance the weft thread toward the fell of the cloth and to make the thread leave the slots adjacent to the fell of the cloth, for subsequent weaving of the weft thread into the cloth.

S 260 w nn m v. wm kr. k dwm ad ,R. 3 3 0 x m5 3 wm S m hoU 2 W mw wvn m E wn H ;m d DIM-n 8 a, u. .l mM B mm S .n w 9 "mm E u Gls l mu" WT whwe m mmm mA 0 M 2 6 ""m rT ha o ts I s u n ,v 6 8 m D 02LM k3 mt E I n T 0 & 1 N. In Mel N z Cfl U .0 m. d v 6 ol H D. mk F A UIF. .ll 1]] 2 l 2 8 6 2 2 555 5 ll [[rt 3,744,532 7/1973 139/12 3,766,950 10/1973 Vasek et 139 12 4 Claims, 4 Flgums PATENTEDSEP 3l974 SHEET 1 U 2 l BEAT-UP MECHANISM FOR DOOMS The present invention relates to beat-up mechanisms of weaving looms operating on a pointwise or frontal beat-up principle, and, more particularly, it relates to the beat-up mechanisms of looms wherein weft thread carriers are associated with a drive that is independent of the beat-up mechanism and may be employed to utmost advantage in looms of the progressive shedding type.

At present, there are known beat-up mechanisms of weaving looms, comprising a rotary shaft having mounted thereon a plurality of mutually displaced beat-up discs with lugs adapted to beat up a weft thread to the fell of the cloth, as well as open slots adapted to advance the weft thread. As the shaft is rotated, the beat-up lugs form a moving helical surface, while the slots form a moving helical groove.

To advance the weft thread into the slots of the beatup discs. the weft thread carriers are provided with an abutment receivable in the disc slot; as a weft thread carrier operates, its abutment moves in the helical groove formed by these slots and lays the weft thread therein. I

In the vicinity of the fell of the cloth, the weft thread leaves the slot of the disc, and the beat-up lugs beat it up to the fell of the cloth, whereby the weft thread is retained in this position by the discs, for the latter have a progressively increasing radius and gradually form the beat-up lugs.

The abutment of the weft thread carrier moving in the slots of the discs, the pitch of the helical groove is bound to be relatively great, which affects the capacity of the loom. Furthermore, the rate of feed of the weft thread carrier and the angular speed of the shaft are to be precisely timed, since even a slight mistiming might lead to breakdown both of the discs and of the carriers.

To properly retain and form the fell of the cloth, it is necessary that the tangent to the edge of the discs at the beat-up point should intersect the warp thread crossing or shed line at an angle of about 90, which can be attained in the above beat-up mechanism solely by the disc being of a relatively great size and the shaft having a relatively small diameter, which is quite impractical from the structural point of view.

There are also known beat-up mechanisms comprising a pair of shafts of which one overlies the other, the discs on both shafts having beat-up lugs and slots. As the two shafts are rotated, the slots thereof coincide and form jointly a groove into which the weft thread is placed upon leaving the weft thread carrier. This beatup mechanism provides for a somewhat greater capacity of the loom due to reduction of the half-wave length of the groove. 7

However, the beat-up mechanisms of the latter type considerably complicate threading of the warp threads through the loom and necessitate precise positioning of one disc-carrying shaft relative to the other.

Furthermore, such a beat-up mechanism would not separate warp threads that adhere to one another; when this happens, the weft thread is not properly engaged by the slots of the discs, which results in faulty weaving and breakage of both weft and warp threads.

It is an object of the present invention to provide 21 beat-up mechanism for weaving looms, which will ensure reliable engagement of the weft thread, thereby improving the quality of weaving and capacity of the loom.

With this and other objects in view, there is presently disclosed a beat-up mechanism for weaving looms wherein weft thread carriers are associated with a drive that is independent of the beat-up mechanism, said mechanism comprising a rotary shaft having fitted thereon mutually disposed beat-up discs provided with lugs forming a moving helical surface when said shaft is rotated, said discs further having open slots adapted to advance a weft thread, said slots forming a moving helical groove when said shaft is rotated, in which mechanism, in accordance with the present invention, fitted on said shaft, intermediate of said beat-up discs, are additional discs each having a tooth adapted to engage the weft thread,'the apex of said tooth being positioned radially intermediate of the apex of said beat-up lugs and the edge of said beat-up disc in the vicinity of said groove, the leading edge of said tooth being aligned with the rear wall of said slot of said beat-up disc in the sense of rotation thereof and being an extension of said rear wall.

With a disc having a thread-engaging tooth being fitted on the shaft intermediate of an adjacent pair of beat-up discs, placing of the weft thread into the slots of the beat-up discs becomes more reliable, since the weft thread, as it is being laid by the carrier, is in the path of this thread-engaging tooth. The latter engages the weft thread by its leading edge and, as the shaft rotates further, the thread slides along the edge of the tooth and is thus guided into the slot of the beat-up disc.

Furthermore, the disc with the thread-engaging tooth ensures the feeding of the weft thread to the fell of the cloth even in cases when the weft thread for some reason has failed to enter the slot of the beat-up disc, for, in such cases, it is the leading edge of the tooth which engages the weft thread.

The present invention is further characterized in that said leading edge of said tooth, projecting radially beyond said edge of said beat-up disc, is shaped as a convex curve gradually forming said apex of said tooth.

Such a shape of the thread-engaging tooth provided for a reliable withdrawal of the weft thread from the slot of the beat-up disc, to be subsequently beaten up by the lugs of the beat-up disc to the fell of the cloth.

The invention is still further characterized in that the radial length of said rear wall of said slot of said beat-up disc is smaller than the length of the front wall thereof, which in combination with reliable retaining of the weft thread in said slot of said beat-up disc, prevents undesirable transfer of the warp threads from one space be tween a pair of said beat-up discs to another such space.

The invention is also characterized in that said apex of said lug of said beat-up disc smoothly merges with the edge of said beat-up disc along a straight line extending tangentially to said edge, which provides for reliable retaining of the weft thread at the fell of the cloth.

Thus, the herein-disclosed beat-up mechanism for weaving looms provides for: a formation of fabrics and cloth of various patterns; a reliable engagement of the weft thread and a reliable transfer thereof from the thread placing area to the cloth fonnation area; obtaining a desired density of warp and weft threads in a fabric; a protection of the discs from being damaged by mistiming of the motion of the weft thread carriers with the operation of the beat-up mechanism; minimizing the wear of the discs.

The present invention will be further described with reference to a preferred embodiment thereof to be used in looms of the progressive shedding type, wherein the weft thread carriers are associated with a drive that is independent of the beat-up mechanism. This beat-up mechanism is illustrated in the appended drawings, wherein:

FIG. 1 is a perspective view of a beat-up mechanism according to the invention;

FIG. 2 shows the position of a beat-up disc relative to the disc with the thread-engaging tooth;

FIG. 3 shows the slot of a beat-up disc;

FIG. 4 shows the position of the discs, when the weft thread is being placed in the shed.

Referring now in particular to the appended drawings, the beat-up mechanism is situated in a shedding zone I FIG. 1) and extends across the entire width of the loom. The beat-up mechanism comprises a rotary shaft 2 fitted thereon with equally spaced beat-up discs 3. The equal spacing between the discs 3 is ensured by shims (not shown) fitted on the shaft 2.

Each spacing between adjacent beat-up discs 3 receives respective warp threads 4 forming the shed 1. Each one of the beat-up discs 3 has two beat-up lugs 5 adapted to beat up a weft thread 6 to the fell 7 of a cloth 8.

The beat-up discs 3 are provided with open slots 9 adapted to receive the weft thread 6. The beat-up discs 3 are fitted on the shaft 2 in mutually displaced fashion, so that when the shaft 2 rotates the lugs 5 of the discs 3 form respective moving helical surfaces 10, while the open slots thereof form a moving helical groove 11. The shaft 2 receives rotation from the main shaft of the loom through a toothed gearing which is not shown in FIG. 1.

The circular edge 12 of each beat-up disc 3 smoothly merges passing along a straight line 13 (FIG. 2), with the apex 14 of the respective lug 3, the straight line 13 extending tangentially to this circular edge 12 of a respective disc 3.

Fitted on the shaft 2 intermediate of adjacent beat-up discs 3 and arranged across the entire width of the beatup device are additional discs 15 each having a tooth 16 adapted to engage the weft thread 6. The apex 17 of this thread engaging tooth 16 is disposed intermediate of the apex 14 of the lug 5 and the circular edge 12 of the beat-up disc 3 in the vicinity of the slot 9.

The discs 15 are keyed to the shaft 2 so that the leading edge 18 of the tooth 16 is aligned with the rear wall 19 of the slot 9 of the beat-up disc 3 in the sense of rotation of the latter, which sense is indicated in the appended drawings with an arrow A. This edge 18 is an extension of the rear wall 19 of the slot 9, which provides for reliable guiding of the weft thread into this slot. The edge 18 of the tooth 16, extending radially beyond the circular edge 12 of the respective beat-up disc 3 is shaped as'a convex curve gradually forming the apex of the tooth. As the shaft 2 is rotated, the apices of the teeth 16 form a rotating helical surface 20 (FIG. 1).

The slot 9 of the beat-up disc 3 may have either a uniform width. as is illustrated in FIG. 2, or have a wider portion 21 (FIG. 3) at the bottom of the slot, which provides for unobstructed motion of the weft thread, as the excessive length of the latter is being taken up by the carrier 22 shown with a dotted line in FIG. 4, the carrier being propelled by its individual drive 23 made independent of the beat-up mechanisms, e.g., by a chain conveyor.

The wider portion 21 (FIG. 3) is formed by an undercut portion 24 of the front wall 25 of the slot 9.

To prevent the warp threads 4 from being transferred from one space between beat-up discs 3 to another such space, the radial length of the rear wall 19 of the slot 9 is smaller than that of its front wall 25 by a distance the front wall 25 including a portion B gradually forming the circular edge 12 of a respective disc The herein-disclosed beat-up mechanism operates as follows.

As the weft thread carriers 22 (FIG. 4) are propelled through the shed 1, the weft thread 6 is placed under tension in proximity to the edge 12 of the beat-up discs 3, Le. it is placed in the path of the rotation of the thread-engaging teeth 16 of the discs 15. As the shaft 2 is rotated, the leading edge 18 of the tooth 16 encounters the weft thread 6 and engages it, further rotation of the shaft 2 making the tensioned thread 6 slide down the edge 18 of the tooth 16 and thus be guided into the slot 9 which passes the thread on to the fell 7 of the cloth 8. Upon approaching the fell 7 of the cloth 8, the thread 6, owing to its own tension and being acted upon from below by the warp threads 4, starts leaving the slot 9 and sliding along the leading edge 18 of the tooth 16, which edge brings the weft thread 6 close to the fell 7 of the cloth 8. After the successive shedding motion, the weft thread is beaten up to the fell 7 by the first beat-up lug 5 of the disc 3. As the shaft 2 continues its rotation, the second beat-up lug 5 of the same beat-up disc 3 re-beats this same thread 6 up to the fell 7. It should be noted that during both the first and second beat-up motions, the tangent 13 which forms one side of the respective lug 5 is positioned at about relative to the line of crossing of the warp threads, which provides for reliable retaining of the weft thread 6 at the fell 7 of the cloth 8.

What is claimed is:

l. A beat-up mechanism for weaving machines wherein the weft thread carriers are associated with drive means independent of the beat-up mechanism, comprising a rotary shaft, beat-up discs fitted on the shaft in an axially spaced relationship to accommodate respective warp threads therebetween, lugs on each one of said beat-up discs adapted to beat up a weft thread, each said lug having an apex, said lugs forming, during the rotation of said disc, moving helical surfaces, an open slot in each said beat-up disc adapted to advance the weft thread toward the fell of the cloth being woven during the rotation of said disc, said slots forming, during the rotation of said shaft, a moving helical groove, said slot of each disc having a front wall and a rear wall, additional discs fitted on said shaft intermediate of said beat-up discs, a thread-engaging tooth on each said additional disc, adapted to engage the weft thread and to guide it into the respective slot of said beat-up disc, each said thread engaging tooth having an apex which is disposed radially intermediate of said apex of said lug of said beat-up disc and the edge of said disc in the vicinity of said slot, each thread- 3. A beat-up mechanism as claimed in claim 1, wherein the radial length of said rear wall of said slot of said beat-up disc is smaller than the radial length of said front wall of said slot. v

4. A beat-up mechanism as claimed in claim 1, wherein said apex of said lug of said beat-up disc smoothly merges with said edge of said disc along a line which is a tangent to said edge. 

1. A beat-up mechanism for weaving machines wherein the weft thread carriers are associated with drive means independent of the beat-up mechanism, comprising a rotary shaft, beat-up discs fitted on the shaft in an axially spaced relationship to accommodate respective warp threads therebetween, lugs on each one of said beat-up discs adapted to beat up a weft thread, each said lug having an apex, said lugs forming, during the rotation of said disc, moving helical surfaces, an open slot in each said beat-up disc adapted to advance the weft thread toward the fell of the cloth being woven during the rotation of said disc, said slots forming, during the rotation of said shaft, a moving helical groove, said slot of each disc having a front wall and a rear wall, additional discs fitted on said shaft intermediate of said beat-up discs, a thread-engaging tooth on each said additional disc, adapted to engage the weft thread and to guide it into the respective slot of said beat-up disc, each said thread engaging tooth having an apex which is disposed radially intermediate of said apex of said lug of said beat-up disc and the edge of said disc in the vicinity of said slot, each threadengaging tooth having a leading edge which is aligned with said rear wall of said slot of said beat-up disc in the sense of rotation thereof and is an extension of said rear wall.
 2. A beat-up mechanism as claimed in claim 1, wherein said leading edge of said thread-engaging tooth of said additional disc, projecting radially beyond said edge of beat-up disc, is shaped as a convex curve forming with said apex of said tooth.
 3. A beat-up mechanism as claimed in claim 1, wherein the radial length of said rear wall of said slot of said beat-up disc is smaller than the radial length of said front wall of said slot.
 4. A beat-up mechanism as claimed in claim 1, wherein said apex of said lug of said beat-up disc smoothly merges with said edge of said disc along a line which is a tangent to said edge. 